// Copyright (c) Appeon. All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. 
// You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0.

using System;

namespace SnapObjects.Data
{
    internal abstract class DeleteBuilderParser : SqlBuilderParser
    {
        public DeleteBuilderParser(
            ISqlStatementFactory factory,
            ISqlGenerationHelper helper,
            ITypeMapper typeMapper) : base(factory, helper, typeMapper)
        {
        }

        public override SqlStatement Parse(SqlBuildStatement statement)
        {
            var stmt = new SqlDeleteStatement();

            var delete = (DeleteBuildStatement)statement;

            this.ParseBuildParameters(delete);

            var hasTable = this.ParseClause(
                delete, stmt.Table, delete.Table, SqlWhitespaceToken.Whitespace);

            if (!this.ParseClause(
                delete, stmt.From, delete.From, SqlWhitespaceToken.Whitespace) &&
                !hasTable)
            {
                throw new InvalidCastException("Missing 'Delete' table.");
            }

            this.ParseClause(
                delete, stmt.From, delete.Join, SqlWhitespaceToken.Whitespace);

            this.ParseClause(
                delete, stmt.Where, delete.Where, SqlWhitespaceToken.Whitespace);

            return stmt;
        }
    }
}
